1 clean room for dust source, outside dust from outdoor air and into the clean room of people and things in addition to carrying the dust source of dust swept clean room clean room clean room daily source of dust and clean room clean indoor dust source mainly from the clean room operations staff, clean room dust production casing and clean room production process equipment and production processes. ① dust production clean room workers. Dust and clean overalls worn material operations personnel action type, dress situation and related workers themselves. Therefore, the clean room workers must wear uniforms provided and action are also subject to certain restrictions. Under normal circumstances, the general electronic assembly process when the body type to wear clean uniforms slight movement, dust production staff of 3.5 ~ 5.0 × 105 cells / person · min (≥0.5μm). It is the main source of dust clean room. ② Dust cleanroom envelope and interior surfaces. With the development of the clean room decoration materials, wear-resistant, anti-static, less dust production of material occurs, clean room construction dust production getting smaller and smaller. Generally considered clean room floor space dust production unit of 3 ~ 5.0 × 104 / m2 · min (≥0.5μm). Visible Dust 10 m2 building only a considerable dust production workers. ③ Dust production equipment and production processes: this dust production equipment and production process itself and are directly related. Different equipment, dust production great difference different production processes. In Japan, data presentation, a motor of dust production of approximately 4.5 ~ 45 × 104 cells / station · min (≥0.5μm).